Having a few other Stirling Engines I was interested in this new design, I have to say it is amazing. It ran for over four hours on top of a small thermos jug filled with water just off a boil. Fantastic and well made
This is a very well-engineered, high quality stirling engine. It will run on the temperature of the palm of my hand at an ambient temperature of 70 degrees Fahrenheit. Excellent little machine.
I got this for a classroom. It gave me a little trouble using warm water and I didn't love the idea of have too hot of water at a table with kids, so I used a hand warmer. Works great! Lasted about an hour. Like these
brought in to work to place about my Yeti tea mug. works great and is a great ice breaker. i encourage all to learn how a stirling engine works so that you can explain to onlookers with slack jaws.